Chris J Dixon wrote:
My caravan, now nearly 10, is showing slightly raised damp
readings in part of the roof. I know from experience that
internal dampness doesn't necessarily indicate the point of
ingress, but that section of roof is essentially flat, and has a
join covered by an aluminium strip secured by many screws.

The screws are effectively irremovable intact, and I don't want
to create a big job when this might not even be the source of any
ingress.

I have already applied sealant around the joint strip, and don't
really want to add more, but I wondered if anyone has experience
of a suitable sealant strip (eg Sylglas) I could apply over the
whole joint?

Chris


Not quite the answer you are looking for, but we bought a Maypole
cover from Amazon which keeps the water out and is breathable. They only
last 2 years before they are scrap IME. The caravan keeps beautifully
clean and we have no damp problems on a 20 year old van. The only
drawbacks are that the fit is not too good and it is necessary to add
zips to provide door and front hatch access. The material is easy to sew
on a domestic sewing machine but you need wooden fingertips to put 32M
of pins in first. She has now discovered why she has a thimble
collection! Zips also come from amazon. Buy 2 x 5M lenghts, it comes as
one piece with good delivery. Use polyester or nylon thread.